[Neil Williams]

so can this be left in the carpet and not extracted i.e when bonneting?

Yes it can.

[Warren Aldridge]

I use it as a spotter. Mix double or triple strength in 1l bottle.
Solves 95% of stains.

I mix it in a 1 litre pump up, with a jet stream flow instead of a dispersed flow, with good pressure it pretty much removes the stain on contact, I dont even use a brush.

[Phil @ Extreme Clean]

gna give it a go cheers guys.